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A method for treating acrylate wastewater and recovering sodium acrylate

A technology of acrylate and sodium acrylate, applied in chemical instruments and methods, water pollutants, natural water treatment, etc., can solve the problems of complex process and high cost, and achieve the effect of simple process and low cost

Active Publication Date: 2017-11-03
POTEN ENVIRONMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention discloses a method for treating acrylate wastewater and recovering sodium acrylate, which is used to solve the problem of complicated process and high cost for treating acrylate wastewater at the present stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Get 2000ml acrylate wastewater, the initial index of acrylate wastewater: the total content of acrylic acid and sodium acrylate is 50158mg / L, COD Cr It is 105400mg / L, and the pH value is 6.5.

[0039] With a mass fraction of 40% H 2 SO 4 Adjust the pH value of acrylate wastewater to 2, add 120mL of 200g / L calcium chloride, shake for 30 minutes, and filter to obtain the filtrate; use sodium-type cation exchange resin to perform ion exchange treatment on the filtrate to reduce the calcium ion content to below 0.2mg / L , to obtain ion-exchanged water; then, use sodium hydroxide to adjust the pH value of ion-exchanged water to 8, with 0.1mol / L Na 2 SO 4 The aqueous solution is used as polar water, which is driven by a magnetic pump to circulate in the electrodialyzer (membrane voltage 0.8V, membrane surface flow rate ≥ 5cm / s). After 1 hour of circulation treatment, the concentrated phase sodium acrylate concentration is concentrated to 9.7%, and the dilute phase sodium ac...

Embodiment 2

[0042] Get 3000ml acrylate wastewater, the initial index of acrylate wastewater: the content of acrylic acid and sodium acrylate is 51773mg / L, COD CrIt is 125400mg / L, and the pH value is 4.

[0043] With a mass fraction of 40% H 2 SO 4 Adjust the pH value of acrylate wastewater to 3, add 30mL of 200g / L aluminum chloride solution, shake for 30min, and filter to obtain the filtrate; use sodium-type cation exchange resin to perform ion exchange treatment on the filtrate to reduce the aluminum ion content in it to 0.2mg / L Below L, get ion-exchanged water; then, use sodium hydroxide to adjust the pH value of ion-exchanged water to 9, with 0.1mol / L Na 2 SO 4 The aqueous solution is used as polar water, and is driven by a magnetic pump to circulate in the electrodialyzer (membrane voltage 0.8V, membrane surface flow rate ≥ 5cm / s). The concentration was reduced to 0.27%. Concentrate the dense phase by evaporation at 120°C. When the specific gravity of the concentrated solution is...

Embodiment 3

[0046] Get 2000ml acrylate wastewater, the initial index of acrylate wastewater: the content of acrylic acid and sodium acrylate is 63548mg / L, COD Cr It is 154860mg / L, and the pH value is 2.

[0047] With a mass fraction of 40% H 2 SO 4 Adjust the pH value of acrylate wastewater to 1.5, add 24g of calcium oxide, shake for 30 minutes, and filter to obtain the filtrate; use sodium-type cation exchange resin to perform ion exchange treatment on the filtrate to reduce the calcium ion content to below 0.2mg / L to obtain ions Exchange the water; then, use sodium hydroxide to adjust the pH value of the ion-exchanged water to 8, with 0.1mol / L Na 2 SO 4 The aqueous solution is used as polar water, which is driven by a magnetic pump to circulate in the electrodialyzer (membrane voltage 0.8V, membrane surface flow rate ≥ 5cm / s). After 1 hour of circulation treatment, the concentration of concentrated phase sodium acrylate is concentrated to 16.7%, and the dilute phase sodium acrylate ...

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Abstract

The invention discloses a method for processing acrylate wastewater and recovering sodium acrylate. The method comprises the following steps: adjusting the pH value of wastewater to 1-5 by a sulfuric acid solution, then adding a coagulant into the wastewater, stirring for 5 to 30 minutes, filtering, collecting the filtrate; using a sodium type cation exchange resin to carry out an ion exchange treatment on the filtrate, collecting the effluent; then adjusting the pH value of the effluent to 7-9 by a sodium hydroxide solution, then carrying out an electrodialysis treatment to obtain a dense phase and a dilute phase; subjecting the dense phase to an evaporation treatment to obtain a concentrated solution with a specific weight of 1.22 to 1.26 and evaporation condensate, cooling to crystallize the concentrated solution, separating the crystallized concentrated solution to obtain sodium acrylate crystals and mother liquor; repeating the previous step on the mother liquor until the mass percentage of sodium acrylate in the mother liquor is not more than 31.2%; and merging the evaporation condensate and dilute phases in the previous two steps. The provided method can remove at least 95% of COD, and the B / C is more than 0.7.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating acrylate waste water and recovering sodium acrylate. Background technique [0002] Acrylates, as an important industrial derivative of propylene, are being used more and more widely. At present, the industry mainly adopts the direct gas phase oxidation of propylene to produce acrylic acid, and then produces acrylate through esterification, and the corresponding acrylate wastewater is produced in the production process. Acrylate wastewater comes from process wastewater, equipment cleaning water, irregular discharge water, etc. The main pollutants are sodium acrylate, acrylic acid, p-toluenesulfonic acid, and acrylate. The water quality is complex, the content of refractory organic matter is high (COD ranges from 50,000-150,000mg / L), and the salt content is high, and the microbial degradability is poor, so it cannot be directly treated by biochemical meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/36C02F101/34
Inventor 乔瑞平杨映李海涛张伦梁蒋玮
Owner POTEN ENVIRONMENT GRP